Tomorrow is National Voter Registration Day, and the non-partisan group HeadCount is taking action by hosting registration events in 30 cities. Alongside that push comes a social campaign featuring photos of indie rock luminaries like Grizzly Bear, TV On The Radio, St. Vincent and Death Cab For Cutie encouraging you to register. HeadCount has more photos — a set which also features folks like Stephen Colbert as well as lots of dudes in jam bands — from the campaign at their Facebook page. Hit the gallery to see some examples.